After examining Medicare data from more than 60,000 men over 75, researchers found that 41.1 percent of men are getting screened without a doctor referral, and 28.8 percent were screened based on a recommendation from their primary care doctor.

Prostate cancer is slow growing, and other research has found that even if a man over the age of 75 gets prostate cancer, he'll likely die from something else.

Prostate cancer screening is a PSA blood test, which looks for a cancer antigen in the blood. Screening is recommended starting at age 45 for African Americans or for those who had an immediate family member with prostate cancer before the age of 65.

Study Shows Link Between Psoriasis and Kidney Disease

University of Pennsylvania researchers compared data between more than 144,000 psoriasis patients and more than 680,000 healthy individuals. They found that those with moderate psoriasis (between 3 and 10 percent of the skin affected) or severe psoriasis (more than 10 percent of their skin affected) had about a 1.5 times higher risk for kidney disease than the healthy patients.

The reason for the link is not known, but researchers said some medications that treat psoriasis, like Enbrel or Humira, could cause kidney damage.

A New Depression Drug Shows Promise

A study published in the journal Molecular Psychiatry found that lanicemine helped relieve symptoms of depression without the side effects normally associated with ketamine (it's used as an anesthetic in people and animals).

"Any new drug that can alleviate depression symptoms is to be welcomed, especially when it is targeted on those severe cases where other medications are not working. The early indications are that lanicemine, through its unique properties, may be such a drug," said Nick Krasner, MRCGP, an expert on depression and an Everyday Health columnist who has a medical practice in Sydney, Australia.

Millions of Babies Born via In Vitro Fertilization

At least five million babies have been born using in vitro fertilization or other methods of assisted reproduction since the first test tube baby in 1978.

According to research presented at the International Federation of Fertility Societies, more than half of those babies have been born in the last six years.